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Influence of Cryo-cross Rolling and Post-Rolled Annealing on Microstructure and High Cycle Fatigue Properties of Al-5052 Alloy

Metallography, Microstructure, and Analysis, ISSN: 2192-9270, Vol: 12, Issue: 3, Page: 505-514
2023
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The present work investigates the influence of cryo-cross rolling (CCR) followed by annealing (CCR + AN) on high cycle fatigue (HCF) of ultrafine grain (UFG) Al 5052 alloy. CCR process was utilized to reduce the thickness of Al 5052 alloy sheets nearly 90% of initial thickness at liquid nitrogen temperature (− 196 °C). In order to investigate the effect of heat treatment on mechanical properties such as yield strength, tensile strength and high cycle fatigue properties, the CCR specimen was heated at a temperature range of 100–250 °C for 45 min. Microstructure of all the specimens and their synergistic effects were analyzed through electron back scattered diffraction, transmission electron microscopy and field emission scanning electron microscope. The formation of UFG-based microstructure and reduced grain size eliminates the chances of stress concentration near the fracture point, resulting higher HCF strength in CCR sample compared to solution treated alloy. On annealing CCR + AN alloy showed exceptional HCF properties, up to 100 °C. This is attributed to enhancement in fracture growth resistance caused by precipitation interaction at grain boundaries. The HCF strength slowly decreases as temperature of annealing rises from (100–250 °C), owing to grain coarsening due to recrystalisation and recovery process in the mentioned temperature range.

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